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-2x+7=-4x-5
We move all terms to the left:
-2x+7-(-4x-5)=0
We get rid of parentheses
-2x+4x+5+7=0
We add all the numbers together, and all the variables
2x+12=0
We move all terms containing x to the left, all other terms to the right
2x=-12
x=-12/2
x=-6
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